Index: build/android/incremental_install/java/org/chromium/incrementalinstall/Reflect.java |
diff --git a/build/android/incremental_install/java/org/chromium/incrementalinstall/Reflect.java b/build/android/incremental_install/java/org/chromium/incrementalinstall/Reflect.java |
new file mode 100644 |
index 0000000000000000000000000000000000000000..7790690aac69a68ebbc67072d3e67a0f8100d3e4 |
--- /dev/null |
+++ b/build/android/incremental_install/java/org/chromium/incrementalinstall/Reflect.java |
@@ -0,0 +1,142 @@ |
+// Copyright 2015 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+package org.chromium.incrementalinstall; |
+ |
+import java.lang.reflect.Array; |
+import java.lang.reflect.Constructor; |
+import java.lang.reflect.Field; |
+import java.lang.reflect.Method; |
+import java.util.Arrays; |
+ |
+/** |
+ * Reflection helper methods. |
+ */ |
+final class Reflect { |
+ /** |
+ * Sets the value of an object's field (even if it's not visible). |
+ * |
+ * @param instance The object containing the field to set. |
+ * @param name The name of the field to set. |
+ * @param value The new value for the field. |
+ */ |
+ static void setField(Object instance, String name, Object value) |
+ throws ReflectiveOperationException { |
+ Field field = findField(instance, name); |
+ field.setAccessible(true); |
+ field.set(instance, value); |
+ } |
+ |
+ /** |
+ * Retrieves the value of an object's field (even if it's not visible). |
+ * |
+ * @param instance The object containing the field to set. |
+ * @param name The name of the field to set. |
+ * @return The field's value. Primitive values are returned as their boxed |
+ * type. |
+ */ |
+ static Object getField(Object instance, String name) throws ReflectiveOperationException { |
+ Field field = findField(instance, name); |
+ field.setAccessible(true); |
+ return field.get(instance); |
+ } |
+ |
+ /** |
+ * Concatenates two arrays into a new array. The arrays must be of the same |
+ * type. |
+ */ |
+ static Object[] concatArrays(Object[] left, Object[] right) { |
+ Object[] result = (Object[]) Array.newInstance( |
+ left.getClass().getComponentType(), left.length + right.length); |
+ System.arraycopy(left, 0, result, 0, left.length); |
+ System.arraycopy(right, 0, result, left.length, right.length); |
+ return result; |
+ } |
+ |
+ /** |
+ * Invokes a method with zero or more parameters. For static methods, use the Class as the |
+ * instance. |
+ */ |
+ static Object invokeMethod(Object instance, String name, Object... params) |
+ throws ReflectiveOperationException { |
+ boolean isStatic = instance instanceof Class; |
+ Class<?> clazz = isStatic ? (Class<?>) instance : instance.getClass(); |
+ Method method = findMethod(clazz, name, params); |
+ method.setAccessible(true); |
+ return method.invoke(instance, params); |
+ } |
+ |
+ /** |
+ * Calls a constructor with zero or more parameters. |
+ */ |
+ static Object newInstance(Class<?> clazz, Object... params) |
+ throws ReflectiveOperationException { |
+ Constructor<?> constructor = findConstructor(clazz, params); |
+ constructor.setAccessible(true); |
+ return constructor.newInstance(params); |
+ } |
+ |
+ private static Field findField(Object instance, String name) throws NoSuchFieldException { |
+ boolean isStatic = instance instanceof Class; |
+ Class<?> clazz = isStatic ? (Class<?>) instance : instance.getClass(); |
+ for (; clazz != null; clazz = clazz.getSuperclass()) { |
+ try { |
+ return clazz.getDeclaredField(name); |
+ } catch (NoSuchFieldException e) { |
+ // Need to look in the super class. |
+ } |
+ } |
+ throw new NoSuchFieldException("Field " + name + " not found in " + instance.getClass()); |
+ } |
+ |
+ private static Method findMethod(Class<?> clazz, String name, Object... params) |
+ throws NoSuchMethodException { |
+ for (; clazz != null; clazz = clazz.getSuperclass()) { |
+ for (Method method : clazz.getDeclaredMethods()) { |
+ if (method.getName().equals(name) |
+ && areParametersCompatible(method.getParameterTypes(), params)) { |
+ return method; |
+ } |
+ } |
+ } |
+ throw new NoSuchMethodException("Method " + name + " with parameters " |
+ + Arrays.asList(params) + " not found in " + clazz); |
+ } |
+ |
+ private static Constructor<?> findConstructor(Class<?> clazz, Object... params) |
+ throws NoSuchMethodException { |
+ for (Constructor<?> constructor : clazz.getDeclaredConstructors()) { |
+ if (areParametersCompatible(constructor.getParameterTypes(), params)) { |
+ return constructor; |
+ } |
+ } |
+ throw new NoSuchMethodException("Constructor with parameters " + Arrays.asList(params) |
+ + " not found in " + clazz); |
+ } |
+ |
+ private static boolean areParametersCompatible(Class<?>[] paramTypes, Object... params) { |
+ if (params.length != paramTypes.length) { |
+ return false; |
+ } |
+ for (int i = 0; i < params.length; i++) { |
+ if (!isAssignableFrom(paramTypes[i], params[i])) { |
+ return false; |
+ } |
+ } |
+ return true; |
+ } |
+ |
+ private static boolean isAssignableFrom(Class<?> left, Object right) { |
+ if (right == null) { |
+ return !left.isPrimitive(); |
+ } |
+ Class<?> rightClazz = right.getClass(); |
+ if (left.isPrimitive()) { |
+ // TODO(agrieve): Fill in the rest as needed. |
+ return left == boolean.class && rightClazz == Boolean.class |
+ || left == int.class && rightClazz == Integer.class; |
+ } |
+ return left.isAssignableFrom(rightClazz); |
+ } |
+} |